On the identity of Navicula gottlandica (Bacillariophyta), with the description of two new species Navicula eileencoxiana and Navicula bergstromiana from the Australo-Pacific region
Abstract: Background and aims - During the past two decades, the subantarctic diatom flora has been the subject of several detailed taxonomic revisions, resulting in the description of a large number of new species. During a survey of the freshwater diatom flora of Macquarie Island (southern Pacific...
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2019
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Online Access: | https://hdl.handle.net/10067/1612410151162165141 https://repository.uantwerpen.be/docman/irua/026227/161241.pdf |
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ftunivantwerpen:c:irua:161241 2024-10-06T13:50:32+00:00 On the identity of Navicula gottlandica (Bacillariophyta), with the description of two new species Navicula eileencoxiana and Navicula bergstromiana from the Australo-Pacific region Sabbe, Koen Vyverman, Wim Ector, Luc Wetzel, Carlos E. John, Jacob Hodgson, Dominic A. Verleyen, Elie Van de Vijver, Bart 2019 pdf https://hdl.handle.net/10067/1612410151162165141 https://repository.uantwerpen.be/docman/irua/026227/161241.pdf eng eng info:eu-repo/semantics/altIdentifier/doi/10.5091/PLECEVO.2019.1607 info:eu-repo/semantics/altIdentifier/isi/000475963600016 info:eu-repo/semantics/openAccess 2032-3913 Plant ecology and evolution Biology info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2019 ftunivantwerpen https://doi.org/10.5091/PLECEVO.2019.1607 2024-09-10T04:06:39Z Abstract: Background and aims - During the past two decades, the subantarctic diatom flora has been the subject of several detailed taxonomic revisions, resulting in the description of a large number of new species. During a survey of the freshwater diatom flora of Macquarie Island (southern Pacific Ocean), an unknown Navicula species was observed showing resemblance to Navicula gottlandica. Populations of similar diatoms (previously reported as N. gottlandica) from Tasmania were also investigated. We here present a detailed morphological analysis of these diatoms, and compare it with the type material of N. gottlandica. Methods - Materials were analysed using Light and Scanning Electron Microscopy. Key results - The southern hemisphere populations represent two hitherto unknown taxa here described as Navicula bergstromiana and N. eileencoxiana. Important morphological differences include valve shape, stria density, shape of the central area, ultrastructure of the external central raphe endings, presence of a distinct internal accessory rib, and the relative width of the external longitudinal silica strips covering the valve face with respect to the longitudinal fissures separating these strips. While the new taxa show some affinity with the genus Haslea, the internal apical structure of the raphe, the external structure of the terminal raphe fissures and the central raphe endings (often with tooth-like protrusions, creating the impression of a satellite pore), and the apparent lack of the typical sandwich-type Haslea valve ultrastructure support the position of N. gottlandica and both new taxa within the genus Navicula. Conclusions - The description of two additional species with close similarities to N. gottlandica (i.e. possessing the typical longitudinal striae/silica strips and tooth-like protrusions in hooked central raphe endings) suggests that the N. gottlandica species group is more diverse than previously thought. The existence of closely similar Navicula species recently described from rivers in ... Article in Journal/Newspaper Macquarie Island IRUA - Institutional Repository van de Universiteit Antwerpen Pacific Plant Ecology and Evolution 152 2 313 326 |
institution |
Open Polar |
collection |
IRUA - Institutional Repository van de Universiteit Antwerpen |
op_collection_id |
ftunivantwerpen |
language |
English |
topic |
Biology |
spellingShingle |
Biology Sabbe, Koen Vyverman, Wim Ector, Luc Wetzel, Carlos E. John, Jacob Hodgson, Dominic A. Verleyen, Elie Van de Vijver, Bart On the identity of Navicula gottlandica (Bacillariophyta), with the description of two new species Navicula eileencoxiana and Navicula bergstromiana from the Australo-Pacific region |
topic_facet |
Biology |
description |
Abstract: Background and aims - During the past two decades, the subantarctic diatom flora has been the subject of several detailed taxonomic revisions, resulting in the description of a large number of new species. During a survey of the freshwater diatom flora of Macquarie Island (southern Pacific Ocean), an unknown Navicula species was observed showing resemblance to Navicula gottlandica. Populations of similar diatoms (previously reported as N. gottlandica) from Tasmania were also investigated. We here present a detailed morphological analysis of these diatoms, and compare it with the type material of N. gottlandica. Methods - Materials were analysed using Light and Scanning Electron Microscopy. Key results - The southern hemisphere populations represent two hitherto unknown taxa here described as Navicula bergstromiana and N. eileencoxiana. Important morphological differences include valve shape, stria density, shape of the central area, ultrastructure of the external central raphe endings, presence of a distinct internal accessory rib, and the relative width of the external longitudinal silica strips covering the valve face with respect to the longitudinal fissures separating these strips. While the new taxa show some affinity with the genus Haslea, the internal apical structure of the raphe, the external structure of the terminal raphe fissures and the central raphe endings (often with tooth-like protrusions, creating the impression of a satellite pore), and the apparent lack of the typical sandwich-type Haslea valve ultrastructure support the position of N. gottlandica and both new taxa within the genus Navicula. Conclusions - The description of two additional species with close similarities to N. gottlandica (i.e. possessing the typical longitudinal striae/silica strips and tooth-like protrusions in hooked central raphe endings) suggests that the N. gottlandica species group is more diverse than previously thought. The existence of closely similar Navicula species recently described from rivers in ... |
format |
Article in Journal/Newspaper |
author |
Sabbe, Koen Vyverman, Wim Ector, Luc Wetzel, Carlos E. John, Jacob Hodgson, Dominic A. Verleyen, Elie Van de Vijver, Bart |
author_facet |
Sabbe, Koen Vyverman, Wim Ector, Luc Wetzel, Carlos E. John, Jacob Hodgson, Dominic A. Verleyen, Elie Van de Vijver, Bart |
author_sort |
Sabbe, Koen |
title |
On the identity of Navicula gottlandica (Bacillariophyta), with the description of two new species Navicula eileencoxiana and Navicula bergstromiana from the Australo-Pacific region |
title_short |
On the identity of Navicula gottlandica (Bacillariophyta), with the description of two new species Navicula eileencoxiana and Navicula bergstromiana from the Australo-Pacific region |
title_full |
On the identity of Navicula gottlandica (Bacillariophyta), with the description of two new species Navicula eileencoxiana and Navicula bergstromiana from the Australo-Pacific region |
title_fullStr |
On the identity of Navicula gottlandica (Bacillariophyta), with the description of two new species Navicula eileencoxiana and Navicula bergstromiana from the Australo-Pacific region |
title_full_unstemmed |
On the identity of Navicula gottlandica (Bacillariophyta), with the description of two new species Navicula eileencoxiana and Navicula bergstromiana from the Australo-Pacific region |
title_sort |
on the identity of navicula gottlandica (bacillariophyta), with the description of two new species navicula eileencoxiana and navicula bergstromiana from the australo-pacific region |
publishDate |
2019 |
url |
https://hdl.handle.net/10067/1612410151162165141 https://repository.uantwerpen.be/docman/irua/026227/161241.pdf |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Macquarie Island |
genre_facet |
Macquarie Island |
op_source |
2032-3913 Plant ecology and evolution |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5091/PLECEVO.2019.1607 info:eu-repo/semantics/altIdentifier/isi/000475963600016 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5091/PLECEVO.2019.1607 |
container_title |
Plant Ecology and Evolution |
container_volume |
152 |
container_issue |
2 |
container_start_page |
313 |
op_container_end_page |
326 |
_version_ |
1812178665724706816 |